Currently there are only 3 vols of the manga scanlated by Endless Dimension, which closed down earlier this year. Some of us from ED (yup, i was an ED Editor for a bit) were going to form a new group and carry on some of the projects, HG included. However that idea seems to have fallen to bits.

Shoujo Magic may be picking it up, but not untril a later date unfortunatly. All in all there's 13 chapters curently available, Omake's included.